Cholangitis is an infection of the common bile duct, the tube that carries bile from the liver to the gallbladder and intestines. Bile is a chemical that helps digest food.
Cholangitis is usually caused by a bacterial infection, which can occur when the duct is blocked by things such as a gallstone or tumor. The infection causing this condition may also spread to the liver.
Risk factors include a previous history of gallstones, biliary diseases such as sclerosing cholangitis, HIV, and, rarely, travel to countries where a worm or fluke infection can be contracted.